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The PIX LAN-to-LAN tunnel is not established, and the pre-shared keys do not match
If the debug crypto isakmp command shows the "reserve not zero on payload 5!" error message, there is a pre-shared keys mismatch.
To confirm use command "show crypto isakmp sa". if the output displays "MM_Key_exchange" ,it mean's that phase 1 is getting stuck at key exchange. Reasons might be because of mismatch in preshare keys or wrong ip address for peer in cryptomap entry.
For LAN-TO-LAN VPN using pre-shared keys, check the key in this command: